Basic Four board set

This seems to be a 16 bit Basic Four processor set.  It's in unusable condition (most likely), and hopefully will yield up the firmware at least.

The possibility it being a 16 bit superset of the 1600 is due to it having 4 74181 ALU chips.  It was designed just shy of the advent of the 2901, which I believe was the next step in the Basic Four / MAI designs of CPUs.

There are 4 total boards in the scrap set, one with the firmware (Intel mask roms), the board with the 74181's (probably the Data board) one with a lot of logic, and a final one with two large connectors out the back (maybe a path to control panel)?

Will have to see if anyone has more Basic Four information.

Firmware chips.

DPS 8 system test attachment. Possibly Multics

This was found in a gold scrap listing, and sadly isn't much more useful than that.  However it does have references in the DPS8 manual.

http://bitsavers.org/pdf/honeywell/dps-8/58010048-500_System_Installation_Manual_jun86.pdf

Also on Archive.org with OCR.  I didn't find an OCR'd version on bitsavers.

https://archive.org/details/bitsavers_honeywelldmInstallationManualjun86_9284781

Front View PSIA NSAJB board

back of the test board.

HIS symbol on board